Make one package of jello according to the instructions on the box (most likely, you’ll combine the jello powder with 1 cup of boiling water and 1 cup of cold water).
Divide the jello between the cups and place it in the refrigerator to set-- this should take about an hour.
Next, make another package of jello according to the instructions on the box. However, this time you’ll whisk in 6 ounces of the whipped topping before pouring it over the first layer (make sure the first layer is fully set before you pour another layer on top). Place the jello cups back in the refrigerator to chill for another hour, or until set.
Repeat the layering and chilling set for the last two layers. The third layer will be a plain jello layer.
The fourth layer will be a creamy layer (jello plus the remaining 8 ounces of cool whip).
Make sure that each of the layers has firmed completely before moving on to the next.
Lastly, top with whipped cream, sprinkles, or berries, if desired. Serve chilled.